Matches 201 - 250 out of 350 < 1 2 3 4 5 6 7 >
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5031066 DC isolation and protection system and circuit  
A precision analog electronic circuit that is capable of sending accurate signals to an external device that has hostile electric characteristics, including the presence of very large common mode...
5027250 Electronic circuit with a protection device against fluctuations in the supply battery voltage  
An electronic circuit with a protection device against fluctuations in the supply battery voltage, being of a type which comprises a MOS power transistor connected between one pole of the battery...
5014180 Lossless snubber circuit  
A snubber circuit for a power switch includes a capacitor coupled across main current path electrodes of the switch, an inductor having a first end coupled to one of the main current path...
5001623 Automatically switching multiple input voltage power supply  
A power supply which automatically adapts to different input power sources. A double pole, double throw, latching relay switches the primaries of the rectifier transformer to a series or to a...
4999730 Line voltage monitor and controller  
A line voltage monitor and controller disconnects AC-powered user equipment from an AC power line whenever the AC power line voltage is outside a predetermined operating voltage window. The...
4980791 Universal power supply monitor circuit  
A power supply monitoring circuit for operating in a plurality of modes comprising first and second single input comparators coupled to first and second inputs, respectively, for sensing the...
4962350 Load condition detecting and driving system  
A load condition detecting a control system for supplying a load current to a load from a power source wherein, when said load exhibits a short circuit condition, a driving signal controlling the...
4953070 Method for transverse-current-free operation of a push-pull circuit, and apparatus for performing the method  
A method for transverse-current-free operation of a push-pull circuit configuration having two output transistor arrays of complementary types with output circuits interconnected in series, and a...
4951171 Power supply monitoring circuitry for computer system  
A computer system having a power supply monitoring arrangement employs a number of comparators for detecting whether or not various supply voltages produced by the power supply for use in the...
4924343 Solid state optical relay  
A solid-state, four terminal optical relay has a current regulator with two input pins, and an output switch with two output pins. The relay includes an optical isolator assembly so that the...
4922364 Series capacitor equipment  
Series capacitor equipment for distribution networks has a capacitor, voltage-dependent resistors as over-voltage protective means for the capacitor, a mechanical high-speed circuit-closer and a...
4918562 Power controller with voltage-controlled circuit breaker  
A power controller comprises a manually-on circuit breaker having an electrically-actuatable trip coil which enables the circuit breaker to be tripped-off electrically. The circuit breaker is...
4916570 Voltage comparator circuit for monitoring a process output voltage within a preset range  
A fluctuating voltage to be monitored is fed to the non-inverting input of a first op amp via a first input resistor; a reference voltage is fed to the inverting input of the second op amp via a...
4890184 Molded case circuit breaker actuator-accessory unit  
An integrated protection unit is a circuit breaker which includes basic overcurrent protection facility along with selective electrical accessories. A molded plastic accessory access cover secured...
4879625 Voltage monitor  
Voltage monitor for monitoring the output voltage of a power source which can be connected to a power load, which includes a reference voltage source, comparators for comparing the power source...
RE33087 Electric power distribution and load transfer system  
A power distribution system includes a plurality of power sources and load transfer units including transistors and diodes connected in series and leading to a common power output, each of the...
4858055 Input protecting device for a semiconductor circuit device  
An input protecting device of a semiconductor circuit device has a first power supply terminal (8) for providing a first supply potential, a second power supply terminal (9) for providing a second...
4843533 Transient ride-through AC inverter  
A transient protection circuit for an inverter has a rectifier capable of supplying direct current from an alternating current power source, where protection is provided against a voltage transient...
4835653 ESD protection circuit employing channel depletion  
An electrostatic discharge protection circuit includes a P - doped channel and an N - doped channel that form a serial path between a signal pad and a transistor. Holes are depleted from the P - ...
4831323 Voltage limiting circuit  
A voltage limiting circuit with two-terminal network character is described which has a sharp-edged limitation characteristic curve and a short response time. According to the invention, this is...
4829415 Push-pull drive circuit for a power converter  
A power supply includes a source of first and second switching signals that are at opposite phases. First and second MOS power transistors have main current conducting electrodes coupled to a...
4825328 Three phase electrical load protection device  
A three phase electrical load protection device is disclosed including an input transducer for detecting each phase voltage and the direction of rotation of the phases of a three phase power...
4823227 Three-phase monitor circuitry  
Solid state circuitry designed to protect three phase electrical equipment operating from two hundred forty (240) to four hundred eighty (480) volt power from loss of any phase, phase reversal, or...
4819116 Fault indicator light control circuit  
A fault indicator light control circuit for a regulator controlled alternator/battery charging system has a first transistor connected with a light bulb in its conductive path to be turned "ON"...
4803587 Arrangement for change-over contact apparatus protection with interlocking member and module  
A changeover contact-making apparatus with interlocking member and module of protection protected against overcurrents is provided. In a same case, two contact-making systems and coil switches are...
4797570 Automatic paralleling of AC power sources  
A system for effecting parallel operation of a pair of AC power sources includes a monitoring circuit for monitoring the difference voltage occurring between output voltages on corresponding phases...
4787022 High voltage power source for a discharge tube  
A high voltage power source for supplying a DC high voltage to a discharge tube, can detect an abnormality when created at the discharge tube side and stop its output. The high voltage power source...
4780805 Low/high input voltage power supply  
A power supply which automatically configures itself to correctly respond to either a low or a high level of an A.C. supply voltage to supply a single level D.C. output voltage. The supply switches...
4780656 Drive and protection system for variable speed motor  
An electronic control for a motor drives the motor with pulses of current, and protects the motor from extreme values of line voltage and motor current. A current sensor, connected in series with a...
4779027 DC to DC converter with overvoltage protection circuit  
An overvoltage protection circuit limits the output voltage of a DC to DC converter to a maximum desired output voltage. An output voltage sensing circuit includes a semiconductor device such as a...
4772980 Immersion cooling safety monitoring system  
A safety monitoring system for an immersion cooling system of a large, high-density electronic assembly such as a supercomputer protects against the possibility of toxic gas formation due to...
4772979 Voltage shock protection circuit  
A voltage shock protection circuit having two anti series connected field effect transistors adapted for being connected between a conductor and a protected circuit for connecting the protected...
4757177 High-frequency induction heating system with circuit protective feature  
A high-frequency induction system can generally be achieved by detecting noise superimposed on AC power supply which might induce voltages exceeding the given break-down voltage of a switching...
4750078 Semiconductor protection circuit having both positive and negative high voltage protection  
An input protection circuit is provided which prevents positive and negative voltages significantly higher than a supply voltage potential from damaging operational circuitry connected to an input...
4716372 Circuit arrangement for monitoring the current supply of an electric consumer  
A circuit arrangement for monitoring the current supply of an electric consumer has a voltage regulator connected to an operating voltage that is variable over time and has a voltage monitor for...
4707760 Mains protection device  
A mains protection device for a.c. mains comprises a circuit for detecting whether or not the mains voltage is within an amplitude window. When the voltage goes above or below the window, the mains...
4707758 Fail-safe system in a power regulation circuit for an automotive electronic circuit  
A fail-safe system in a power regulation circuit for an automotive electronic circuit such as electronic anti-skid brake control system, which fail-safe system can perform fail-safe operation even...
4704654 Over-voltage protective circuit for semiconductor network  
To protect electrical equipment against excessive applied input signals which, for example, may be analog signals, excessive with respect to positive or negative excess voltage in relation to an...
4698720 Dynamic protection integrated device, in particular for MOS input stages integrated circuits  
This dynamic protection device is particularly intended for integrated circuits having input MOS stages and logic or analog inputs fed by voltages and/or currents whose value can increase above...
4694372 Circuit diagnosis and control device  
A circuit diagnosis and control device adapted to detect defects in a primary electrical circuit and temporarily discontinue power to the primary circuit in the event of a defect. A MOS transistor...
H000330 Personnel grounding system tester  
Apparatus for on-site testing of wrist straps or shoe straps of the type d to prevent the buildup of electrostatic charges on the body and clothing of a worker engaged in handling charge-sensitive...
4685020 Shutdown circuit for blocking oscillator power supply  
A protective circuit arrangement is provided for shutting down a power supply at the occurrence of a fault condition. The circuit arrangement allows current limiting in a switching transistor...
4677311 Power supply system for an electronic apparatus having memory  
A power supply system includes a main power unit for supplying power necessary for the operation of an electronic apparatus including a memory, an auxiliary power unit for supplying power necessary...
4672228 Battery backup system for switched power supply  
A battery back-up system providing a short term hold-up for a converter type switched power supply. The back-up system includes a regulated charger circuit for maintaining the battery in a charged...
4663539 Local power switching control subsystem  
Each digital module in a network is provided with a local power switching control subsystem wherein the local module uses a local power switching control logic card which controls main power and...
4660122 Foldback current limiting circuit  
A current limiting device that, with increases of input voltage, the current increases to a first value and, as the input voltage increases further, the current decreases to a second value so as to...
4631623 DC power control circuit with status reporting and protection against overloads and short circuits  
A DC power control circuit with status report and protection against overloads and short circuits is provided in which the output stage comprises at least one output amplifier whose input receives...
4623833 Alternator system multifunction fault detector  
Three possible types of "faults" may be detected in the ignition system of a vehicle, using simple combinational logic to provide an essentially error-free activation of an indicator when a true...
4599504 Induction heating apparatus with protection against power interruption  
According to the present invention, an induction heating apparatus comprises a rectifying circuit for rectifying an AC voltage from an AC power source, an inverter circuit for converting a DC...
4597026 Inverter variable dead time for X-ray generator  
In an X-ray generator system having a pulse-width-modulated transistor inverter with associated flywheel diodes, method and apparatus is provided to sense when a diode associated with a...
Matches 201 - 250 out of 350 < 1 2 3 4 5 6 7 >